<?php
/**
* Global Search Engine for Moodle
*
* @package search
* @category core
* @subpackage document_wrappers
* @author Valery Fremaux [valery.fremaux@club-internet.fr] > 1.8
* @date 2008/03/31
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
*
* this is a format handler for getting text out of a proprietary binary format 
* so it can be indexed by Lucene search engine
*/

/**
* @param object $resource
* @uses $CFG
*/
function get_text_for_indexing_htm(&$resource, $directfile = ''){
	global $CFG;
	
	// SECURITY : do not allow non admin execute anything on system !!
	if (!has_capability('moodle/site:doanything', get_context_instance(CONTEXT_SYSTEM))) return;

	// just get text
	if ($directfile == ''){
		$text = implode('', file("{$CFG->dataroot}/{$resource->course}/{$resource->reference}"));
	} else {
		$text = implode('', file("{$CFG->dataroot}/{$directfile}"));
	}

	// extract keywords and other interesting meta information and put it back as real content for indexing
	if (preg_match('/(.*)<meta ([^>]*)>(.*)/is', $text, $matches)){
		$prefix = $matches[1];
		$meta_attributes = $matches[2];
		$suffix = $matches[3];
		if (preg_match('/name="(keywords|description)"/i', $meta_attributes)){
			preg_match('/content="([^"]+)"/i', $meta_attributes, $matches);
			$text = $prefix.' '.$matches[1].' '.$suffix;
		}
	}
	// brutally filters all html tags
	$text = preg_replace("/<[^>]*>/", '', $text);
	$text = preg_replace("/<!--[^>]*-->/", '', $text);
	$text = html_entity_decode($text, ENT_COMPAT, 'UTF-8');
	$text = mb_convert_encoding($text, 'UTF-8', 'auto');
	
	/*
	* debug code for tracing input
	echo "<hr/>";
	$FILE = fopen("filetrace.log", 'w');
	fwrite($FILE, $text);
	fclose($FILE);
	echo "<hr/>";
	*/
	
	if (!empty($CFG->block_search_limit_index_body)){
		$text = shorten($text, $CFG->block_search_limit_index_body);
	}
	return $text;
}
?>